[LCD] EC 207 LOGIC CIRCUIT DESIGN KTU MODAL QUESTIONS FOR SECOND YEAR S3 EC

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

QUESTION PAPERS

PART A

(Answer All Questions)

1. Explain Comparator.

2. What is a Multiplxer and Draw the block diagram of a 4-input multiplexer.

3. Define the NOR gate through truth table.

4. State and prove Demorgans Theorem.

5. Define Universal gate.

PART B

(Answer Any Two Questions)

6. What is K-map and simplify the following

1) Y=∑m(0,1,2,5,13,15)

2) Y= A’B’CD + A’BCD’ + A’B’C’ + A’B’D’ + AC’ + B’

7. a) Simplify the following Boolean Expressions

1) AB’ + A’B + A’B’ AB

2) (AB + C) (AB + D)

b) Explain Duality Principle.

8. Design Combinational circuit for Octal to Binary Encoder.